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At the wedding at Cana Jesus performs his 1st public miracle. They ran out of wine which was terrible, right? It was the behest of Mary that he did this - an important point.

Here's the gospel reading and I'll follow with Mary's explanation. 

THE GOSPEL ACCORDING TO JOHN

The wedding at Cana.

Chapter 2

1 On the third day there was a wedding in Cana in Galilee, and the mother of Jesus was there.

2 Jesus and his disciples were also invited to the wedding.

3 When the wine ran short, the mother of Jesus said to him, "They have no wine."

4 (And) Jesus said to her, "Woman, how does your concern affect me? My hour has not yet come."

5 His mother said to the servers, "Do whatever he tells you."

6 Now there were six stone water jars there for Jewish ceremonial washings, each holding twenty to thirty gallons.

7 Jesus told them, "Fill the jars with water." So they filled them to the brim.

8 Then he told them, "Draw some out now and take it to the headwaiter." So they took it.

9 And when the headwaiter tasted the water that had become wine, without knowing where it came from (although the servers who had drawn the water knew), the headwaiter called the bridegroom

10 and said to him, "Everyone serves good wine first, and then when people have drunk freely, an inferior one; but you have kept the good wine until now."

11 Jesus did this as the beginning of his signs in Cana in Galilee and so revealed his glory, and his disciples began to believe in him.

Mary's explanation. 

The Self-Manifestation of Jesus at the Wedding of Cana (To Jesus through Mary)

 [Our Celestial Mother says:] “My dearest child, My Heart is swollen with love, and I felt the need to tell you the reason why, together with My Son, I wanted to be present at this wedding of Cana.  Do you think it was because of a simple ceremony?  No, child, there are profound mysteries.  Pay attention to Me, and I will tell you new things: how My love of Mother was displayed in an incredible manner, and how the love of My Son gave true signs of paternity and royalty for the creatures.

 “Now listen to Me.  My Son had come back from the desert, and was preparing Himself for His public life; but first He wanted to be present at this wedding, and therefore He allowed Himself to be invited.  We went there, not to celebrate, but to work great things for the human generations. My Son took the place of Father and King in the families, and I took the place of Mother and Queen.  With Our presence We renewed the sanctity, the beauty, the order of the marriage formed by God in the Garden of Eden – that of Adam and Eve – married by the Supreme Being in order to populate the earth, and to multiply and increase the future generations.  Marriage is the substance from which arises the life of the generations; it can be called the trunk from which the earth is populated.  The priests, the religious, are the branches; but if it were not for the trunk, not even the branches would have life. Therefore, through sin, by withdrawing from the Divine Will, Adam and Eve caused the family to lose its sanctity, beauty and order.  And I, your Mama, the new innocent Eve, together with My Son, went to reorder that which God did in Eden; I constituted Myself Queen of families, and impetrated the grace that the Divine Fiat might reign in them, that I might have families which would belong to Me, holding the place of Queen in their midst.

 “But this is not all, My child. Our love was burning, and We wanted to make known to them how much We loved them, and to give them the most sublime of lessons. And here is how: at the height of the lunch, wine lacked, and My Heart of mother felt consumed with love, wanting to give help. Knowing that My Son can do anything, with supplicating accents, but certain that He would listen to Me, I say to Him: ‘My Son, the spouses have no more wine.’ And He answers Me: ‘My hour to do miracles has not yet come.’ And knowing that He certainly would not deny what His Mama asked of Him, I said to those who were serving the table: ‘Do what My Son tells you, and you will have what you want; even more, you will receive in addition, and in superabundance.’

“My child, in these few words I gave a lesson, the most useful, necessary and sublime for the creature. I spoke with the heart of a mother and I said: My children, do you want to be holy? Do the Will of My Son. Do not move from what He tells you, and you will have His likeness, His sanctity in your power. Do you want all evils to cease? Do whatever My Son tells you. Do you want any grace, even difficult? Do whatever He tells you and wants. Do you also want the necessary things of natural life? Do whatever My Son tells you. Because in His words, in everything He tells you and wants, He encloses such power that, as He speaks, His word contains what you ask for, and makes the graces you desire arise within your souls. How many see themselves as full of passions, weak, afflicted, unfortunate and miserable; yet, they pray and pray, but because they do not do what My Son asks, they obtain nothing; Heaven seems to be closed for them. This is a sorrow for your Mama, because I see that while they pray, they move away from the source in which all goods reside – the Will of My Son.

“Now, those who were serving did precisely what My Son said to them – that is: “Fill the jars with water and bring them to the table.” My dear Jesus blessed that water and it turned into delicious wine. Oh, a thousand times blessed, the one who does what He says and wants! With this, My Son gave Me the greatest honor, He constituted Me Queen of miracles; this is why He wanted My union and My prayer in doing His first miracle. He loved Me too much-so much that He wanted to give Me first place as Queen in miracles also. And with facts, not with words, He said: ‘If you want graces and miracles, come to My Mother; I will never deny anything She wants.’

“In addition to this, My child, with My presence at this wedding, I looked at the future centuries. I saw the Kingdom of the Divine Will upon earth; I looked at families, and I pleaded for them to symbolize the love of the Sacrosanct Trinity, so that Its Kingdom might be in full force. With My rights of Mother and Queen, I took to heart Its regime; and since I possessed the source of it, I placed at the creatures’ disposal all the graces, the helps and the sanctity which are needed to live in a Kingdom so holy. So I keep repeating: ‘Do whatever My Son tells you.’

“My child, listen to Me: look for nothing else, if you want to have everything in your power, and give Me the contentment of being able to make of you My true child, and child of the Divine Will. Then will I take on the commitment of forming the marriage between you and the Fiat; and acting as your true Mother, I will bind the marriage by giving you the very life of My Son as dowry, and My maternity and all My virtues as gift”. (“The Virgin Mary in the Kingdom of the Divine Will” – Appendix 6)